For what it's worth, Mephiles/Solaris' dream of consuming all existing timelines until nothing remains should absolutely be inside of Maginary World. The implication of that is kind of confusing though. If the dream to destroy all of Maginary World is inside Maginary World, does that mean Maginary World contains itself infinitely? In that case, when Solaris nukes the cosmology, is he also nuking the MW dream-verse in which he successfully does the same thing and consumes all timelines? What a mind-****. Did anyone else ever think about how paradoxical this is? If Maginary World really works how it claims to work, Mephiles/Solaris' dream would make it infinitely layered.......
Solaris' ambition to destroy MW is within MW, which is within the scope of of Solaris' destruction, which is within MW, which is within the scope of Solaris' destruction, and so on. I have yet to figure out what this means for the cosmology and for the feat itself...